The Prophet by Kahlil Gibran

And when you work with love you bind yourself to yourself, and to one another, and to God. And what is it to work with love. It is to weave the cloth with threads drawn from your heart, even as if your beloved were to wear that cloth. It is to build a house with affection, even as if your beloved were to dwell in that house. It is to sow seeds with tenderness and reap the harvest with joy, even as if your beloved were to eat the fruit. It is to charge all things you fashion with a breath of your own spirit, And to know that all the blessed dead are standing about you and watching.

Fill each other's cup but drink not from one cup. Give one another of your bread but eat not from the same loaf. Sing and dance together and be joyous, but let each one of you be alone, Even as the strings of a lute are alone though they quiver with the same music. Give your hearts, but not into each other's keeping. For only the hand of Life can contain your hearts.

It is a short book, you will read it in a couple of hours. It deals with 26 of the most important subjects in life – love, marriage, children, giving, eating and drinking, work, joy and sorrow, houses, clothes, buying and selling, crime and punishment, laws, freedom, reason and passion, pain, self-knowledge, teaching, friendship, talking, time, good and evil, prayer, pleasure, beauty, religion, and death.

On good and evil:

Of the good in you I can speak, but not of the evil. For what is evil but good tortured by its own hunger and thirst? Verily when good is hungry it seeks food even in dark caves, and when it thirsts it drinks even of dead waters.

I love The Prophet for the beautiful language. And for the deep and very inspiring answers, that for the most part I agree with.